<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8"/>
        <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
        <meta http-equiv="X-UA-Compatible" content="ie=edge"/>
        <title>Document</title>
        <script>
            var name = 10;
            var obj = {}
            console.log(name + 10 + obj );

            // alert(num);
            // alert(typeof name); //window的一个属性，是一个字符串
        </script>
    </head>
    <body>
        
    </body>
</html>